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A fluid‐dynamically based model of bubble column reactors
Author(s) -
Gasche HansErich,
Edinger Christine,
Kömpel Harald,
Hofmann Hanns
Publication year - 1990
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.270130147
Subject(s) - bubble , continuous stirred tank reactor , turbulence , mixing (physics) , mechanics , absorption (acoustics) , bubble column reactor , chemistry , mass transfer , flow (mathematics) , phase (matter) , momentum (technical analysis) , thermodynamics , chemical reactor , component (thermodynamics) , multiphase flow , materials science , physics , gas bubble , organic chemistry , quantum mechanics , finance , economics , composite material
Abstract A heterogeneous fluid dynamic model has been developed to describe the complex flow structure of two‐phase in bubble columns. The equation of continuity and momentum balances form the basis of the model. Coupling of the two phases occurs via an interaction force, deduced by a force balance around a single rising bubble. Multiphase flow mixing processes are taken into consideration by introducing turbulent viscosities of the two phases involved. The Simulation program was extended to reactive system, taking into account the mass balances of a second order gas‐liquid chemical reaction as well as the different absorption/reaction regimes. The gas phase concentration profiles show pronounced axial and radial dependences, while the liquid phase can be regarded as a CSTR with respect to the liquid component. With reference to the gaseous component, which is being absorbed in the liquid phase, the degree of back mixing does not show CSTR behaviour as the influence of different absorption conditions in different axial and radial reactor positions is superposed on that of turbulent motion of the liquid carrier of the dissolved gaseous component.